Medifast makes no claim that these results are representative of all participants on the Medifast Program. Medifast recommends you consult with a physician before starting a weight-loss program. Individual results will vary. Medifast is the brand recommended by more than 20,000 doctors since 1980. Typical weight loss on the Medifast 5 & 1 Plan® is 2-5 lbs per week for the first two weeks and 1-2 lbs per week thereafter. Davis, L.M., Coleman, C.D., Kiel, J., Rampolla, J., Hutchisen, T., Ford, L., Andersen, W.S., Hanlon-Mitola, A. (2010). Efficacy of a meal replacement diet compared to a food-based diet after a period of weight loss and weight maintenance: a randomized controlled trial. Nutrition Journal, 9(11). View Study